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Added arcfour code needed for SMB password changing.

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Jeremy (jallison@whistle.com)
(This used to be commit 8bc3d13b3d66fc533d5bc6abf3fc9d5c67d0f286)
This commit is contained in:
Jeremy Allison 1997-09-18 19:56:57 +00:00
parent 563cf6f4aa
commit 501755a87c
2 changed files with 126 additions and 0 deletions
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91
source3/arcfour.c Normal file
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/*
Unix SMB/Netbios implementation.
Version 1.9.
a implementation of arcfour designed for use in the
SMB password change protocol based on the description
in 'Applied Cryptography', 2nd Edition.
Copyright (C) Jeremy Allison 1997
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "arcfour.h"
void set_arc4_key(unsigned char *data, int key_length, arc4_key *arckey)
{
unsigned int i;
unsigned char j;
unsigned char tc;
unsigned char *s_box = &arckey->s_box[0];
arckey->index_i = 0;
arckey->index_j = 0;
for(i = 0; i < 256; i++)
s_box[i] = (unsigned char)i;
j = 0;
for( i = 0; i < 256; i++)
{
j += (s_box[i] + data[i%key_length]);
tc = s_box[i];
s_box[i] = s_box[j];
s_box[j] = tc;
}
}
void arc4(arc4_key *arckey, unsigned char *data_in, unsigned char *data_out,
int length)
{
unsigned char tc;
int ind;
unsigned char i, j;
unsigned char t;
unsigned char *s_box = &arckey->s_box[0];
for( ind = 0; ind < length; ind++)
{
i = ++arckey->index_i;
j = arckey->index_j += s_box[i];
tc = s_box[i];
s_box[i] = s_box[j];
s_box[j] = tc;
t = s_box[i] + s_box[j];
*data_out++ = *data_in++ ^ s_box[t];
}
}
#if 0
/* Test vector */
unsigned char key_data[] = { 0x61, 0x8a, 0x63, 0xd2, 0xfb };
unsigned char plaintext[] = { 0xdc, 0xee, 0x4c, 0xf9, 0x2c };
unsigned char ciphertext[] = { 0xf1, 0x38, 0x29, 0xc9, 0xde };
int main(int argc, char *argv[])
{
unsigned char out[5];
arc4_key key;
set_arc4_key(key_data, 5, &key);
arc4(&key, plaintext, out, 5);
if(memcmp(out, ciphertext, 5) ==0)
printf("Test ok !\n");
else
printf("Test fail !\n");
return 0;
}
#endif

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source3/arcfour.h Normal file
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#ifndef _ARC4_H_
#define _ARC4_H_
/*
Unix SMB/Netbios implementation.
Version 1.9.
a implementation of arcfour designed for use in the
SMB password change protocol based on the description
in 'Applied Cryptography', 2nd Edition.
Copyright (C) Jeremy Allison 1997
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
typedef struct {
unsigned char s_box[256];
unsigned char index_i;
unsigned char index_j;
} arc4_key;
#endif /* _ARC4_H_ */